/etc/default/ufw IPV6=yes -> mettre en rem #
ufw status
ufw show raw
ufw enable
ufw disable
ufw allow
sudo ufw default deny
sudo ufw allow 80,443/tcp
ufw deny 53
ufw deny 53/tcp
ufw delete deny 80/tcp
ufw allow from 192.168.0.4 to any port 22
ufw deny from 207.46.232.182